Affymetrix's CEL files. Only text format supported. Binary file must be converted using Affymetrix's conversion tool. This tool does not change file extension, so be sure your file really is in text format.

data bpmap cels returns a list associating probes with pairs of (PM,MM) idata in each of the given cel files (in the same order of course). Raise Failure if any file in cels lacks a value for any probe in bpmap.